Ubuntu USN · USN-8251-1

libpng vulnerabilities

Published: Thu, 07 May 2026 13:37

CVE-2026-33416CVE-2026-33636CVE-2026-34757

Summary

Several security issues were fixed in libpng.

Details

It was discovered that libpng incorrectly handled memory when processing certain PNG files. If a user or automated system were tricked into opening a specially crafted PNG file, an attacker could use this issue to cause libpng to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-33416) It was discovered that libpng incorrectly handled expanding 8-bit paletted rows to RGB or RGBA on ARM processors. If a user or automated system were tricked into opening a specially crafted PNG file, an attacker could use this issue to cause libpng to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-33636) It was discovered that libpng incorrectly handled certain setter APIs. An attacker could possibly use this issue to obtain sensitive information. (CVE-2026-34757)

Recommended actions per Ubuntu release

StackPatch playbook auto-generated per release codename and per affected package.

Ubuntu jammy

libpng1.6→1.6.37-3ubuntu0.5apt_upgrade
Standard apt upgrade. Install 1.6.37-3ubuntu0.5 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libpng1.6
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libpng-dev→1.6.37-3ubuntu0.5apt_upgrade
Standard apt upgrade. Install 1.6.37-3ubuntu0.5 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libpng-dev
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libpng-tools→1.6.37-3ubuntu0.5apt_upgrade
Standard apt upgrade. Install 1.6.37-3ubuntu0.5 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libpng-tools
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libpng16-16→1.6.37-3ubuntu0.5apt_upgrade
Standard apt upgrade. Install 1.6.37-3ubuntu0.5 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libpng16-16
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu noble

libpng1.6→1.6.43-5ubuntu0.6apt_upgrade
Standard apt upgrade. Install 1.6.43-5ubuntu0.6 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libpng1.6
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libpng-dev→1.6.43-5ubuntu0.6apt_upgrade
Standard apt upgrade. Install 1.6.43-5ubuntu0.6 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libpng-dev
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libpng-tools→1.6.43-5ubuntu0.6apt_upgrade
Standard apt upgrade. Install 1.6.43-5ubuntu0.6 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libpng-tools
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libpng16-16t64→1.6.43-5ubuntu0.6apt_upgrade
Standard apt upgrade. Install 1.6.43-5ubuntu0.6 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libpng16-16t64
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu questing

libpng1.6→1.6.50-1ubuntu0.5apt_upgrade
Standard apt upgrade. Install 1.6.50-1ubuntu0.5 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libpng1.6
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libpng-dev→1.6.50-1ubuntu0.5apt_upgrade
Standard apt upgrade. Install 1.6.50-1ubuntu0.5 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libpng-dev
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libpng-tools→1.6.50-1ubuntu0.5apt_upgrade
Standard apt upgrade. Install 1.6.50-1ubuntu0.5 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libpng-tools
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libpng16-16t64→1.6.50-1ubuntu0.5apt_upgrade
Standard apt upgrade. Install 1.6.50-1ubuntu0.5 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libpng16-16t64
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

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